The nodes represent characters of the GoT saga. The edges maybe represent the number of times the characters have interacted with each other. These edges represent the relationships between characters.
The rows stand for the character pairings relationship strength. The columns stand for character 1, character 2, interaction strength.
We use the directed = FALSE argument because the adjacency matrix entails information about the direction in the symmetry. Here however we don’t have any symmetry information and therefore we need to be explicit.
The cut value defaults to 0 for graphs with less then 20 nodes. For larger graphs the cut value is automatically chosen to be equal to the maximum of the 75th quantile of absolute edge strengths or the edge strength corresponding to 2n-th edge strength (n being the number of nodes). In this case it equals 14.
qgraph regards the highest of the maximum or highest absolute edge weight as the highest weight to scale the edge widths too. To compare several graphs, set this argument to a higher value than any edge weight in the graphs (typically 1 for correlations). In this case it equals 96.
The plots with the different minimum values are shown below:
The plots with the different cutoff values are shown below:
The layout remains the same using minimum because edges with absolute weights under that value are not shown (but not omitted). The layout differ using threshold because edges with absolute weight that are not above this value are removed from the network. This differs from minimum which simply changes the scaling of width and color so that edges with absolute weight under minimum are not plotted. Setting a threshold influences the spring layout and centrality measures obtained with the graph whereass setting a minimum does not.
## City Node.Strength Closeness Betweenness
## Atlanta Atlanta 3 0.005347594 23.42381
## Bangkok Bangkok 5 0.005076142 41.98203
## # A tibble: 5 x 5
## variable max min Cities_max Cities_min
## <fct> <dbl> <dbl> <chr> <chr>
## 1 Node Strength 11 1 Istanbul St. Petersburg
## 2 Node Strength 11 1 Hong Kong St. Petersburg
## 3 Closeness 38 1 Chicago Seoul
## 4 Betweenness 46 1 London Beijing
## 5 Betweenness 46 1 London Buenos Aires
## Color Betweenness Closeness Node Strength
## 1 black 190.0787 0.005326764 4.333333
## 2 blue 156.0685 0.005395670 3.916667
## 3 red 102.9432 0.004929818 3.916667
## 4 yellow 141.2428 0.005086484 3.333333
I think that the most dangerous is the black virus.